Heavy weekend rains caused more than 50,000 gallons of sewage to spill from a manhole off Superior Avenue in Decatur.
The TV station 11Alive said the overflow was reported Saturday but crews couldn't stop the spill until noon Sunday. DeKalb County officials said 51,050 gallons ran into a tributary of Peachtree Creek, the station reported.
11Alive said the county health department and the EPA were notified.
A flood watch was lifted early Monday for most of metro Atlanta, though the northwest part of the state remains under the watch, ajc.com reported Monday morning.
The weather forecast from weatherbug.com calls an 80 percent chance of rain Monday with a slight chance of thunderstorms in the afternoon. High temperatures will be in the lower 60s.
The forecast calls for partly cloudy skies and highs in the 70s the rest of the week, with thunderstorms possible next weekend.